Brush holder for electrical machines



Dec. 16, 1930. c. w. DAKE BRUSH HOLDER FOR ELECTRICAL MACHINES Filed Oct. 15, 1926 2 Sheets-Sheet l INVENTOR Czar/2,5 Mia/Q6 ATTORNEY Dec. 16, 1930. C.W.'DAKE 1,785,183

BRUSH HOLDER FUR ELECTRICAL MACHINES Filed 1926 2 Sheets-Sheet 2 INVENTOR (Zar/eg; llfia/e ATTORNEY Patented Dec. 16, 1930 UNITED STATES PATENT OFFICE CHARLES W. DAKE, OF CHICAGO, ILLINOIS, ASSIGNOR TO. THE PYLE-NAIIONAL COM- PANY, OF CHICAGO, ILLINOIS, A CORIOBATION OF NEW JERSEY j BRUSH HOLDER FOR ELECTRICAL MACHINES Application filed October 15, 1926. Serial Ito/141,765.

My invention relates to a new and improved type of brush holder for electric machines, such as generators, motors and the like, and has for one object to provide a holder where- 5 by the brush may be adjusted toward and from the commutator, whereby the brush may be easily and conveniently removably held, whereby an adjustable spring pressure of the brush against the commutator may be provided, and Wherebythe movement of the holder toward the commutator as the brush wears may be held within safe limits. Other objects will appear from time to time in the course of the specification.

I illustrate my invention more or less diagrammatically in the accompanying drawings, wherein Figure 1 is an end view of a generator with the shaft in section, showing the brush hold- 2o ers in place;

Figure 2 is a longitudinal section through the generator, showing the brush holders;

Figure 3 is a perspective view of the brush holder itself;

Figure e is a side elevation of the brush holder viewed from the left of Fig. 3;

Figure 5 is a section through the supporting plate;

Figure 6 is a plan view of the brush-holding arm;

Figure 7 is an end View of the brush-holding arm viewed from the left in Fig. 6;

Figure 8 is a side elevation of the brushholding plate;

I Figure 9 is a section through the brushholding arm showing the brush in place.

Like parts are indicated by like figures throughout the specification and drawings.

A is a generator housing having supportings legs or feet A A is the armature, A the shaft, A the commutator. The housing A is inwardly flanged as at A and contains the insulating brush-holding ring A bolted in place.

B is the brush-holding plate. It is held on the ring A by the screws B B there being two or more of these brush-holding plates, all identical, so the description of one suffices for all. The brush-holding plate is provided with a laterally and outwardly extended arm B From this arm project pivot pins B B and the arm terminates in a stop lug B? adjacent the pin B. Each of these pins is interiorly threaded. I

Rotatable on the pin B is a brush arm G, comprising a sleeve C to engage the pin B and adapt it to be held thereon by a screw C and: washer C This arm terminates in a socket C split throughout most of its length. G is the brush engaged in the socket and clamped therein by means of the screw C,- which extends across between the two parts of the arm and draws them and the two parts of the brush sockettogether to grip the a conducting lead extending from the brush to the plate B, where it is grounded. C is a engage the lugs D disposed radially with respect to the ring B The screw D interiorly threaded in' the pin 13*, holds the tension drum in register with the lugs against removement. When this screw is backed off the knurled portion D on the drum may be held by the operator in order to rotate the drum, to increase the spring tension. D is a fiat coil spring wound around thetension drum and dead-headed thereon, having a brush-holding arm D extending laterally and bent as at D to engage the rearend of the bruslrarm. Rotation of the drum in a clockwise directiomasin Fig. 3, increases the tension on the spring. Rotation in the opposite direction decreases the tension. The

stop B lies in the path of'the arm C, so that as, thebrush wears andthe arm. moves down toward the commutator the stop is engaged arm pivoted on one pin, a brush carriedby' the arm, a tension member rotatable on the other pin, an arm projecting from the tens1on member engaglng the free end ofthe brush holding arm and means for adjusting the tension therein, said means comprising a drum, a spring wound about the drum and interposed between it and the tension arm and means for locking the drum in adjustedposition.

2. A brush holder for electric machines and the like comprising a plate, a fixed arm projecting therefrom, a pivot pin projecting from the arm perpendicular to the plane of the plate, a brush holder pivoted on the pin,

a tension member rotatable on the arm and a spring finger projecting therefrom to engage the free end of the brush holder;

3. A brush Y holder for electric machines and the like comprising a plate, a fixed arm projecting therefrom, a pivot pin projecting from the arm perpendicular to the plane of the plate, a brush holder pivoted on the pin, a tension member rotatable on the arm and a spring finger projecting therefrom to engage the free end of the brush holder, the tension member comprising a drum, a spring wound about it, the end of the spring forming a tension finger.

l. A brush holder for electric machines and the like comprising a plate, a fixed arm projecting therefrom, a pivot pin projecting from the arm perpendicular to the plane of the plate, a brush holder pivoted on the pin, a tension member rotatable on the arm and a spring finger projecting therefrom to engage the free end of the brush holder, the tension member comprising a drum, a spring wound about it, the end of the spring forming a tension finger, interlocking members onthe plate and drum whereby the drum may be held in adjusted position, means for releasing the drum to permit adjusting rotation.

5. A brush holder comprising a flat plate, a lug projecting laterally from one edge thereof, an arm projecting from the lug parallel with but in a different plane from the plate, pivot pins projecting from the lug and from the end of the arm perpendicular to the end of'the plate, a brush holder pivotally mounted on thepin on the arm, a tension member on the pin projecting from the lug engaging the free end of the brush holder.

6; A brush support for electric machines,

comprising a plate, a pair of pivot pins projecting from the plate, a brush, a socket in which the brush is removably but rigidly held, an arm associated with the ring and mounted for rotation on one of the pins, a

tension drum rotatably mounted on the other pin, a spring projecting from the drum enthe arm, and means for adjustably rotating the drum to control the tension of the spring on the brush carrying arm, a stop associated with the brush pivot to limit the movement of the ar ntoward the commutator.

'Z. A brush support for electric machines and the like, a plate, a finger integral with the plate projecting inwardly toward the commutator of the machine, a pair of pivot pins projecting from the plate at rightangles to the plane thereof, one of them mounted on the finger, the other mounted on the plate at the intersection of the axial line of the finger and plate, an arm pivotally mounted on the pin carried by the finger, a brush removably socketed in the arm adapted to engage the commutator, a flexible electric connection between the brush and the plate, a tension drum mounted for rotation on the other pivot linger, a spring arm projectingfrom the tension drum, engaging the free end of the brush supporting arm, the tension drum being rotatable to adjust the tension of the spring and means for locking'it in adjusted position, the locking means comprising a notch in the face of the drum, a lug on the plate and a screw adapted when tightened to force the notch and luginto engagement to hold the'drum in position and loosened to permit the drum to rotate freely on the pin.

Signed at Chicago, county of Cook, and State of Illinois, this 13th day of October.

CHARLES W. DAKE. 

